UX: Skip applying link-type watched words to user custom fields (#20465)

We currently apply type: :link watched words to custom user fields. This makes the user card pretty ugly because we don't allow html / links there. Additionally, the admin UI also does not say that we apply this to custom user fields, but only words in posts.

So this PR is to remove the replacement of link-type watch words for custom user fields.

app/models/user.rb

@@ -1523,7 +1523,9 @@ class User < ActiveRecord::Base
 
   def apply_watched_words
     validatable_user_fields.each do |id, value|
-      set_user_field(id, WordWatcher.apply_to_text(value))
+      field = WordWatcher.censor_text(value)
+      field = WordWatcher.replace_text(field)
+      set_user_field(id, field)
     end
   end
 

app/services/word_watcher.rb

@@ -132,18 +132,18 @@ class WordWatcher
 
   def self.replace_text(text)
     return text if text.blank?
-
-    %i[replace link]
-      .flat_map { |type| word_matcher_regexps(type).to_a }
-      .reduce(text) do |t, (word_regexp, attrs)|
-        case_flag = attrs[:case_sensitive] ? nil : Regexp::IGNORECASE
-        replace_text_with_regexp(t, Regexp.new(word_regexp, case_flag), attrs[:replacement])
+    replace(text, :replace)
   end
+
+  def self.replace_link(text)
+    return text if text.blank?
+    replace(text, :link)
   end
 
   def self.apply_to_text(text)
     text = censor_text(text)
     text = replace_text(text)
+    text = replace_link(text)
     text
   end
 
@@ -246,4 +246,15 @@ class WordWatcher
   end
 
   private_class_method :censor_text_with_regexp
+
+  private
+
+  def self.replace(text, watch_word_type)
+    word_matcher_regexps(watch_word_type)
+      .to_a
+      .reduce(text) do |t, (word_regexp, attrs)|
+        case_flag = attrs[:case_sensitive] ? nil : Regexp::IGNORECASE
+        replace_text_with_regexp(t, Regexp.new(word_regexp, case_flag), attrs[:replacement])
+      end
+  end
 end

spec/models/user_spec.rb

@@ -362,6 +362,23 @@ RSpec.describe User do
             end
           end
         end
+
+        context "when watched words are of type 'link'" do
+          let(:value) { "don't replace me" }
+          let!(:replace_word) do
+            Fabricate(
+              :watched_word,
+              word: "replace",
+              replacement: "touch",
+              action: WatchedWord.actions[:link],
+            )
+          end
+
+          it "does not replace anything" do
+            user.save!
+            expect(user_field_value).to eq value
+          end
+        end
       end
 
       context "when user fields do not contain watched words" do

spec/services/word_watcher_spec.rb

@@ -361,7 +361,7 @@ RSpec.describe WordWatcher do
     end
   end
 
-  describe ".apply_to_text" do
+  describe "word replacement" do
     fab!(:censored_word) do
       Fabricate(:watched_word, word: "censored", action: WatchedWord.actions[:censor])
     end
@@ -382,6 +382,23 @@ RSpec.describe WordWatcher do
       )
     end
 
+    it "censors text" do
+      expect(described_class.censor_text("a censored word")).to eq(
+        "a #{described_class::REPLACEMENT_LETTER * 8} word",
+      )
+    end
+
+    it "replaces text" do
+      expect(described_class.replace_text("a word to replace meow")).to eq("a word replaced meow")
+    end
+
+    it "replaces links" do
+      expect(described_class.replace_link("please visit https://notdiscourse.org meow")).to eq(
+        "please visit https://discourse.org meow",
+      )
+    end
+
+    describe ".apply_to_text" do
       it "replaces all types of words" do
         text = "hello censored world to replace https://notdiscourse.org"
         expected =
@@ -416,3 +433,4 @@ RSpec.describe WordWatcher do
       end
     end
   end
+end